Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,974,420
0x7F3b…00cC
The eight checks
20 pools use this hook, the first one 62 d ago.
- 01caution
Permissions that touch your moneyThe address enables before swap returns delta, after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02caution
What it takes from a swapIt takes 2.00% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05pass
No one holds the switchNo owner and no admin functions found.
- 06pass
The code cannot changeNot a proxy, no DELEGATECALL, no SELFDESTRUCT.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record20 pools over 62 days.
Measured at block 92,974,420. A hook with an owner or a dynamic fee can behave differently later; scan again before a large trade.
What the address allows
A v4 hook's permissions are the last fourteen bits of its address. The PoolManager calls only what they switch on.
address & 0x3fff0x00cc · 00000011001100
- bit 13Before initialize
- bit 12After initialize
- bit 11Before add liquidity
- bit 10After add liquidity
- bit 9Before remove liquidity
- bit 8After remove liquidity
- bit 7Before swap
- bit 6After swap
- bit 5Before donate
What it did to a real swap
A small swap each way and a liquidity round trip, run through the PoolManager and this hook inside a call that is never sent. The pool fee is expected; anything else missing is the hook.
ETH / 3POOLS
fee 0%- Swap ETH → 3POOLShook takes 2.00%
- Swap 3POOLS → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x42269384c06b8a41f8f3e2f9e2a030fee85ea3f329ad4fa0e3c3e1ea59ac154e
ETH / 3POOLS
fee 0%- Swap ETH → 3POOLShook takes 1.00%
- Swap 3POOLS → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xd783c723710358e834d02c3c327c54f0f175955549a5eddf92a63c78f356d103
Read from the bytecode
- Code size
- 5,529 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 2
- Callbacks open to anyone
- none
Its functions, uncensored
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.
- 0x023cda03 MAX_BASE_TAX_BPS
- 0x1a03ab15 registerLaunch
- 0x1f2d8550 launches
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x4e01f338
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- Before swap returns delta. Can take part of what you put into a swap, or change how much is swapped.
- After swap returns delta. Can take part of what you get out of every swap.
SELL_TIER3_BPS
0x575e24b4 beforeSwap0x632e081f SELL_CYCLE_LEN0x68288049 BUY_TIER3_BPS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x70e9d244 feeLocker0x774cff2d SELL_TIER6_BPS0x8da10869 SNIPE_WINDOW_SECONDS0x8e79acfd SNIPE_TAX_BPS0x8fdd6751 tokenForPool0x95f61c48 MAX_WHITELIST0x968ff535 MIN_BASE_TAX_BPS0x9f063efc afterAddLiquidity0xa02187f2 BUY_TIER4_BPS0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbe378228 PROTOCOL_FEE_BPS0xc18b49d3 BUY_CYCLE_LEN0xc45a0155 unknown0xc4e833ce getHookPermissions0xda605bf7 SELL_TIER5_BPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe1f1c4a7 BASIS_POINTS0xf4099811 isWhitelisted